Homework Helper Lesson 9 Estimate Quotients

Name
Number and Operations in Base Ten
5.NBT.4, 5.NBT.6
Lesson 9
Estimate Quotients
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Estimate 78.74 ÷ 42.
Estimate 78.74 ÷ 42 by rounding.
Round 78.74 and 42 to the nearest ten.
78.74 ÷ 42
80 and 40 are
compatible numbers.
80 ÷ 40
Divide. 80 ÷ 40 = 2
So, 78.74 ÷ 42 is about 2.
Practice
Copyright © The McGraw-Hill Companies, Inc.
Estimate each quotient.
1. 32.17 ÷ 7
2. $175.32 ÷ 3
3. 21.9 ÷ 3
4. 36.3 ÷ 6
5. 17.5 ÷ 5
6. 120.6 ÷ 2
Lesson 9 My Homework433
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433
1/22/13
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Grade: 5
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Problem Solving
Use the table to answer Exercises 7–9.
Substance
Mass (g)
Volume (cm3)
The information in the table can be used to
determine the density of each object. Density
describes how tightly the particles in an object
are packed together. You can find density by
dividing an object’s mass by its volume.
Aluminum
Gold
Mercury
13.5
56.7
121.5
5
3
9
7. Estimate the density of aluminum.
8. Is the density of gold greater than the density
of mercury? Explain.
9. The density of gold is about how many times
greater than the density of aluminum?
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11.
Model Math Write a division problem involving
the division of a decimal by a whole number with an estimated
quotient of 7.
Test Practice
12. Kendall measured the rainfall in her area for a year. Her readings
totaled 34.56 inches. Which is the best estimate of the average
rainfall per month?
A
about 1 inch per month
C
about 3 inches per month
B
about 2 inches per month
D
about 4 inches per month
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10. Harry’s mother makes cakes for a local restaurant.
t.
She buys flour and sugar in large amounts. She has
157.86 pounds of flour and 82.69 pounds of sugar.
ar.
If she uses 15 pounds of flour and 8 pounds of sugar
ugar
each day, for about how many days will the flour
ur last?